edit-string [--editor|:E filename] [--encoding|:e encoding] [--allow-empty|:0] expression

Evaluating given expression to a string, save it in a temporary file, open the file an external editor as a plain text, and when the editor exits, read and return the result. The --editor (:E) parameter can be used to provide an editor command, whereas --encoding (:e) can be used to specify character encoding used for communication with the editor. If the result is empty, the interactive XSH2 shell asks user for confirmation before returning the result in order to prevent data loss due to some unexpected error. To suppress this feature, use --allow-empty or :0 flag.